I have an 1104-XE with the latest everything I believe. On the 4 channels 2-3-4 all are within 1 mV of zero with the input shorted gain max. However Ch1 is at +3 mV. I did a self cal and its the same afterwards as before. Is there an adjustment or something I need to do? Is this within tolerance? Its not very important, however only one channel seems to be afflicted so there may be more to this.
Do you mean "gain max" that means you have set channels for 500uV/div.
I have never seen that with this setting channel is +3mV offset. (with this setting +3mV is outside from screen. With 500uV/div whole sceen vertical range is -2mV to +2mV
1mV offset is 2 div. Also this I have never seen exept in chase that selfcal is out of order. (it can also happen if oscilloscope is cal ok in +24 and just after turn on from -20 celsius... during warm up it may of course drift quite lot)
Please do, all next even if you have done it earlier
First turn it on and set it to
factory default state (not front panel "Deafault" button). (you can findFactory Default from Save/Recall menu -> Recall -> Type: select from list Factory Default -> Press to Recall)
And then keep all as is.
Keep oscilloscope running alone least 30minute in place where it can reach thermal equilibrium..
Then
NOTHING connected to oscilloscope input connectors. All BNC need be open!
Start Selfcal. Do not touch anything during this and keep all strong EMI sources far away from near inputs, including your fingers.
After it is finished.
Still do not connect anything to inputs. Do not adjust any other things but next
Turn all 4 channels on and set all channels for 500uV/div. All trace positions 0.0V (you can push Position knob or adjust it so that it is perfectly 0.0V)
If real trace is not vertical center do not adjust it to center using Position.
Only just connect USB memory stick and push "print" button for get screen image to USB. (naturally if you allready have PC connected to scope then screen shot using it)
Display this image here so we can see this situation and because you do exactly as asked we also know perfectly what is oscilloscope state when this image is taken.